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Changing Material Properties

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LSherid

Mechanical
Jan 20, 2016
2
Hello,
I am currently adapting an already existing Abaqus Model of an Additive Manufacturing process that includes a moving heat source along a substrate. The current model (190 different load steps) uses the temperature dependent properties of Ti-64 and runs completely within a day. When I change the material properties to another material of interest (IN718), the simulation runs much slower sometimes taking days to get only to step 20. I am assuming that the reason for this is due to the initial time step (about 1e-7) that I specify for each load step or possibly because of the DELTMX that I specify (DELTMX=200). Each step in the new simulation takes about 2000 increments to complete, but the Ti-64 model only takes about 20-40 for each step. I am expecting high thermal gradients and high cooling rates, but I need the simulation to be able to run quickly a I have a lot of simulations to run. What should I try to do to reduce my run-time?

Thanks.
 
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I am not familiar with this type of analysis. Nevertheless, I am curious to know why you are using such a small initial time step? Also, if there is nothing you can do, get yourself some cluster time!

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The initial time step is so small because each time step is very small, sometimes only fractions of a second. The entire simulation only covers a couple of seconds of transient behavior, so each time step is very small. Unfortunately, I do not have access to a cluster at this time, so I'm trying to do everything I can do to minimize the time on my workstation. Thanks.
 
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